Dragonfly 65cm Premium Anti-Burst Yoga Ball Dragonfly's™ premium weight yoga and exercise balls are made from a heavy weight vinyl, providing more stability and rigidity for the most technical moves. The burst resistant feature ensures safety and performance, as the ball will deflate slowly even if punctured. Our premium yoga balls enhance poses like back bends, hip openers, and restorative poses. Also perfect for stretching, balance and stability, training and toning exercises. Yoga balls are a key part in helping to develop core strength. Pump for ball included.